Characteristic

Pertaining to, or serving to constitute, the character; showing the character, or distinctive qualities or traits, of a person or thing; peculiar; distinctive.

A distinguishing trait, quality, or property; an element of character; that which characterized.

The integral part (whether positive or negative) of a logarithm.

a distinguishing quality; a feature that can be used to identify something

a prominent attribute or aspect of something; "the map showed roads and other features"; "generosity is one of his best characteristics"

the integer part (positive or negative) of the representation of a logarithm; in the expression ‘log 643 = 2.808’ the characteristic is 2